[all-commits] [llvm/llvm-project] 3951a7: [Flang][Driver] Handle target CPU and features

[Usman Nadeem via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3951a73490df0f3dd307e8ea6aa52d2776259a4c
      https://github.com/llvm/llvm-project/commit/3951a73490df0f3dd307e8ea6aa52d2776259a4c
  Author: Usman Nadeem <mnadeem at quicinc.com>
  Date:   2022-12-02 (Fri, 02 Dec 2022)

  Changed paths:
    M clang/include/clang/Driver/Options.td
    M clang/lib/Driver/ToolChains/Clang.cpp
    M clang/lib/Driver/ToolChains/CommonArgs.cpp
    M clang/lib/Driver/ToolChains/CommonArgs.h
    M clang/lib/Driver/ToolChains/Flang.cpp
    M clang/lib/Driver/ToolChains/Flang.h
    M flang/include/flang/Frontend/TargetOptions.h
    M flang/lib/Frontend/CompilerInvocation.cpp
    M flang/lib/Frontend/FrontendActions.cpp
    M flang/test/Driver/driver-help.f90
    A flang/test/Driver/target-cpu-features.f90

  Log Message:
  -----------
  [Flang][Driver] Handle target CPU and features

This patch:

- Adds target-feature and target-cpu to FC1Options.
- Moves getTargetFeatures() from Clang.cpp to CommonArgs.cpp.
- Processes target cpu and features in the flang driver. Right now
  features are only added for AArch64/x86 because I only did basic
  testing on them but it should generally work for others as well.
  Option handling is similar to clang.
- Adds appropriate structures in TargetOptions and passes them to
  the target machine.

What's missing:

- Adding the CPU info and the features as attributes in the LLVM IR
  module.
- Processing target specific flags, e.g. SVE vector bits for AArch64,
  ABI etc.

Differential Revision: https://reviews.llvm.org/D137995

Change-Id: Ib081a74ea98617674845518a5d2754edba596418